Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income applicable to Piedmont	$ 8,153	$ 50,208	$ 10,942	$ 57,830	$ 58,361	$ 68,772
Other comprehensive income/(loss):
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)	(3,465)		1,747		(5,489)	3,264
Plus: Reclassification of net (gain)/loss included in net income (See Note 5)	(672)		(245)		(1,443)	807
Other comprehensive income/(loss)	(4,137)	$ (2,795)	1,502	$ 2,569	(6,932)	4,071
Comprehensive income applicable to Piedmont	$ 4,016		$ 12,444		$ 51,429	$ 72,843